Crucible-furnace.



W. BUESS.

CRUOIBLE FURNAGB. APPLICATION FILED we. 9, 1910.

Patented Nov. 12,1912.

2 SHEETSSHEET 1.

COLUMBIA PLANOGRAPH C0.,\VA5H!NGTON. n. c.

W. BUESS. GRUCIBLE FURNACE. APPLICATION FILED we. 9, 1910.

Patented Nov. 12, 1912.

2 SHEETS-SHBET 2.

COLUMBIA PLANOGRAPH C0,,WASHINOTON, D- c.

are.

WILI-IELM BUESS, OF HANOVER, GERMANY.

ORUGIBLE-FURNACE.

Specification of Letters Patent.

Patented Nov. 12, 1912.

Application filed August 9, 1910. Serial No. 576,346.

To all whom it may concern:

Be it known that I, VVILHELM Bonss, a citizen of Germany, and residingat Hanover, Germany, have invented certain new and useful Improvementsin Crucible-Furnaces, of which the following is a specification.

This invention relates to a crucible furnace employing liquid or gaseousfuel and comprises more particularly novel means for continuing theheating of the furnace after the latter has been tilted for emptying thecrucible.

The invention further comprises novel means for cooling the bottom ofthe furnace so that the life of the latter is prolonged.

In the accompanying drawing: Figure 1 is an elevation of my improvedfurnace; Fig. 2 a plan thereof, and Fig. 3 a vertical section on lineA-B, Fig. 1.

The cylindrical casing 1 of the furnace is provided with hollowtrunnions 2 hung in standards 8, while below the furnace base 7 there isprovided a cooling chamber 17. Above base 7 casing 1 has a radialheating duct 39 and a diametrically opposed slag discharge opening 40,,which is normally closed by a lid 41. The crucible 3 rests preferablyupon a suitable support 4 placed upon base 7 The furnace is normallyclosed by a cover 13 hinged at 22 to an arm 20 adjustably secured to arod 21 which may be raised and lowered by hand wheel 5 in any suitablemanner. The crucible may be tilted by means of a hand wheel 32 and aworm 34: which engages a worm wheel 33 fast on one of the trunnions 2.

The fuel is supplied to one of the hollow trunnions 2 from a pipe 35which is connected thereto by a suitable stufling box 6. This trunnionis, by pipe 35*, connected to a heater 36 arranged below the furnace andmovable therewith. From said chamber leads a pipe 35 to a nozzle 14arranged opposite opening 39. Compressed air is supplied from a pipe 18connected to the other trunnion by a stuffing box 6*, said secondtrunnion being connected through pipe 18 with the interior of coolingchamber 17. From the latter leads a pipe 37 to a lower compartment ofheater 36 which is in turn connected by pipe 37 to nozzle 14. In thisway the cool compressed air supplied through pipe 18 is utilized forcooling chamber 17 while the air thus heated is used for preheating thefuel passing through heater 36. A valve controlled by-pass 37 connectspipes 37, 37 so as to disconnect the air supply from heater 36 wheneverthe latter has become sufficiently hot.

\Vith the construction described, nozzle 14 participates in allmovements of the furnace, so that the heating of the latter may becontinued even after it has been tilted. This arrangement is ofparticular importance when a crucible breaks, so that by opening lid 41the metal gathering at bottom 7 may be discharged without permitting itto form deposits on the walls and without any waste of metal.

I claim:

A crucible furnace comprising a pair of standards, a tiltable aperturedcasing having a pair of hollow trunnions hung in said standards, acooling chamber at the bottom of the casing, a heating chamber tiltablewith the casing, means for supplying fuel to one of the hollowtrunnions, a pipe connecting said trunnion to the heating chamber, anozzle opposite the casing-aperture, means for conveying the fuel fromthe heating chamber to said nozzle, means for supplying compressed airto the other trunnion, means for connecting said last named trunnion tothe cooling chamber to cool the base of the casing whereby said air isheated, means for conveying said heated air to the heater for heatingthe fuel, and means for conveying the air from the heater to the nozzle.

In testimony whereof I aflix my signature in the presence of twowitnesses.

WILHELM BUESS.

Witnesses:

R. P. THOMPSON, N. GOLDAMMER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

